I have a 2011 sonata turbo limited with 1000 miles on it and my speedometer is off by 3 m.p.h at any speed (going 73 meter sayes 70 i have confirmed this with 3 different gps units. A tom tom ,garmin,passport. They all say i am doing 70 when the speedometer says 73. 33 mph shows 30. And my dealer sayes this is normal. I have never had this problem in any other car . I also used these gps in other cars and the speed was the same on both gps and speedometer. Does anyone else have this problem? My tire pressure is the same in all 4 tires.